My work gifted me a plastic coffee mug, which I’ve been using on and off for my tea. The lid cracked yesterday and it sputtered nice warm tea on my shirt.
Replaced it with a thermos. Stainless steel, keeps the tea hot and my hands cool. It’s a bit pricey, but I think it’ll last a while.
Man, vacuum-sealed cups and flasks are one of those little things that remind you we have been living in the future for a hundred years or more. I have a Zojirushi tumbler that exposes about 7 in2 (45 cm2) to the air and still keeps coffee hot for a couple of hours.